export default {
    state: {
        visitedViews: [],
        cachedViews: []
    },
    getters: {},
    mutations: {
        ADD_VISITED_VIEW: (state, view) => {
            if (state.visitedViews.some(v => v.path === view.path)) return
            state.visitedViews.push(
                Object.assign({}, view, {
                    title: view.meta.title || 'no-name'
                })
            )
        },
        ADD_CACHED_VIEW: (state, view) => {
            if (state.cachedViews.includes(view.name)) return
            if (!view.meta.noCache) {
                state.cachedViews.push(view.name)
            }
        },

        DEL_VISITED_VIEW: (state, view) => {
            for (const [i, v] of state.visitedViews.entries()) {
                if (v.path === view.path) {
                    state.visitedViews.splice(i, 1)
                    break
                }
            }
        },
        DEL_CACHED_VIEW: (state, view) => {
            const index = state.cachedViews.indexOf(view.name)
            index > -1 && state.cachedViews.splice(index, 1)
        },

        DEL_OTHERS_VISITED_VIEWS: (state, view) => {
            state.visitedViews = state.visitedViews.filter(v => {
                return v.meta.affix || v.path === view.path
            })
        },
        DEL_OTHERS_CACHED_VIEWS: (state, view) => {
            const index = state.cachedViews.indexOf(view.name)
            if (index > -1) {
                state.cachedViews = state.cachedViews.slice(index, index + 1)
            } else {
                // if index = -1, there is no cached tags
                state.cachedViews = []
            }
        },

        DEL_ALL_VISITED_VIEWS: state => {
            // keep affix tags
            const affixTags = state.visitedViews.filter(tag => tag.meta.affix)
            state.visitedViews = affixTags
        },
        DEL_ALL_CACHED_VIEWS: state => {
            state.cachedViews = []
        },

        UPDATE_VISITED_VIEW: (state, view) => {
            for (let v of state.visitedViews) {
                if (v.path === view.path) {
                    v = Object.assign(v, view)
                    break
                }
            }
        }
    },
    actions: {
        ["tagsView/addView"]({dispatch}, view) {
            dispatch('tagsView/addVisitedView', view)
            dispatch('tagsView/addCachedView', view)
        },
        ["tagsView/addVisitedView"]({commit}, view) {
            commit('ADD_VISITED_VIEW', view)
        },
        ["tagsView/addCachedView"]({commit}, view) {
            commit('ADD_CACHED_VIEW', view)
        },

        ["tagsView/delView"]({dispatch, state}, view) {
            return new Promise(resolve => {
                dispatch('tagsView/delVisitedView', view)
                dispatch('tagsView/delCachedView', view)
                resolve({
                    visitedViews: [...state.visitedViews],
                    cachedViews: [...state.cachedViews]
                })
            })
        },
        ["tagsView/delVisitedView"]({commit, state}, view) {
            return new Promise(resolve => {
                commit('DEL_VISITED_VIEW', view)
                resolve([...state.visitedViews])
            })
        },
        ["tagsView/delCachedView"]({commit, state}, view) {
            return new Promise(resolve => {
                commit('DEL_CACHED_VIEW', view)
                resolve([...state.cachedViews])
            })
        },

        ["tagsView/delOthersViews"]({dispatch, state}, view) {
            return new Promise(resolve => {
                dispatch('tagsView/delOthersVisitedViews', view)
                dispatch('tagsView/delOthersCachedViews', view)
                resolve({
                    visitedViews: [...state.visitedViews],
                    cachedViews: [...state.cachedViews]
                })
            })
        },
        ["tagsView/delOthersVisitedViews"]({commit, state}, view) {
            return new Promise(resolve => {
                commit('DEL_OTHERS_VISITED_VIEWS', view)
                resolve([...state.visitedViews])
            })
        },
        ["tagsView/delOthersCachedViews"]({commit, state}, view) {
            return new Promise(resolve => {
                commit('DEL_OTHERS_CACHED_VIEWS', view)
                resolve([...state.cachedViews])
            })
        },

        ["tagsView/delAllViews"]({dispatch, state}, view) {
            return new Promise(resolve => {
                dispatch('tagsView/delAllVisitedViews', view)
                dispatch('tagsView/delAllCachedViews', view)
                resolve({
                    visitedViews: [...state.visitedViews],
                    cachedViews: [...state.cachedViews]
                })
            })
        },
        ["tagsView/delAllVisitedViews"]({commit, state}) {
            return new Promise(resolve => {
                commit('DEL_ALL_VISITED_VIEWS')
                resolve([...state.visitedViews])
            })
        },
        ["tagsView/delAllCachedViews"]({commit, state}) {
            return new Promise(resolve => {
                commit('DEL_ALL_CACHED_VIEWS')
                resolve([...state.cachedViews])
            })
        },

        ["tagsView/updateVisitedView"]({commit}, view) {
            commit('UPDATE_VISITED_VIEW', view)
        }
    }
};
